Added regression test for inconsistent stroke width scaling for text in compound objects

[vihdutta]

Overview: What does this pull request change?

Based on my already merged PR (#4694), I wanted to add a regression test (the test fails before my merged PR code, and succeeds after it). This regression test is based on the original code that reproduced the issue (#4648). I noted it may be important considering I believe I fixed another bug (#4701) with a similar issue.

Motivation and Explanation: Why and how do your changes improve the library?

Bugfix.

Links to added or changed documentation pages

I briefly explained that the added test is a regression test and cited the issue that it corresponds with in the test file.

Further Information and Comments

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested